Gargi
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pH probe
What is the principle behind pH probe meter, Can i fill Nacl solution as electrolyte instead of Kcl solution
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not_important
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http://en.wikipedia.org/wiki/Glass_electrode
http://www.faqs.org/faqs/sci/chem-faq/part6/preamble.html
historical
http://www.jbc.org/cgi/reprint/81/3/581.pdf
http://www.biochemj.org/bj/027/1069/0271069.pdf
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dann2
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Hello,
I read in Wikipedia that a pH probe should be stored in 0.1M HCl.
Is this the way with all pH probes? Dont do it with mine.
Also, is hypochlorite severe on pH probes? (Chlorate cell).
Cheers,
Dann2
[Edited on 21-3-2008 by dann2]
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MagicJigPipe
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I found this at the bottom of the Wikipedia page. This shows you how to build a simple pH meter. Then all you need is a pH probe. Damn it's sexy!
http://www.66pacific.com/ph/ph.aspx
Also, why not just use KCl? It is readily available OTC and extremely inexpensive!
[Edited on 20-3-2008 by MagicJigPipe]
"There must be no barriers to freedom of inquiry ... There is no place for dogma in science. The scientist is free, and must be free to ask any
question, to doubt any assertion, to seek for any evidence, to correct any errors. ... We know that the only way to avoid error is to detect it and
that the only way to detect it is to be free to inquire. And we know that as long as men are free to ask what they must, free to say what they think,
free to think what they will, freedom can never be lost, and science can never regress." -J. Robert Oppenheimer
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Gargi
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Thanks for the responses, Actually the KCL solution in the pH probe has dried out below the specified level and therefore the question, anyway the job
is done with saturated KCl solution.
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dann2
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Hello,
2 more cents worth.
pH probes have very very high output impedence. I remember a project for a pH meter where they stressed the need to use high quality board (for
holding the components) because low quality/cheaper (phenolic based) boards would have a significant conductance between the input pins (coming from
probe).
Dann2
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Drunkguy
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I got one myself recently.
Obviously I had pH papers already which are perfectly okay so long as they are put back into their container afterwards.
What you find on Ebay is these Hong Kong suppliers who "spam" the things until you buy them.
I also bought 3 electronic balances due to similar circumstances. They work GOOD though 
The pH meter I spent £10.99 TOTAL but I havent tested it yet. I still need buffer solutions and deionized water before I can test it.
[Edited on 2-4-2008 by Drunkguy]
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jimwig
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i got something along this line and it goes like this
i recently bought a accumet analog ph meter and the socket connecgtion is a 1/4 inch jack type - as opposed to bnc types with the more modern.
anyone with experience on the older stuff. as in will the newer probes work by just changing their connector? i can make my own probe via ref on JCE
page.
well i can't find the jce article right now. of course but its there.
craZy jiM wGGns
--packrat, professional bum. -- once just tired
now REtired.
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